Pipe-bending machine



Oct'. '21, 1952 E. SENNA PIPE-BENDING MACHINE Filed Feb. ll. 1949 2 SHEETS-SHEET l f Edward Sen/2a 25u ff attqmeg 061:. 2l, 1952 E, SENNA v 2,614,605

PIPE-BENDING MACHINE Filed Feb. 1l, 1949 2 SHEETS--SHEET 2 I '5 l 24 l /7 5;/ lhwntor Gttomeg Patented ct. 21, 1952 l Edward Senna, Spokane, Wash.. assigner-,to Sennay. =AA

- Service Inc.,`a corporation of Washington pplication February 11, 1949, Serial 75.8121 'y i claim. (o1. amk Thisinve'ntionrelates'to a pipe bendingmachine, itbeing understood that' Whileit is particularly adaptedfor bending pipes the machine may be used for bending metal tubes or solid .barsor rods of bendable material. Y

One .object of the invention is to provide a pipe bending machine includingin .its construction a circular head which islmountedupon and turns with the driven shaft of gearing which is driven about which a pipe is bent without being 4crumpled when the head and thedie are turned by rotation of the shaft. Another object of the invention is to provide a" pipe bender `4wherein' the circular-head is disposed over a platformJ or pl'at'eto which the mofrom amotor, said head carryinga circulardie .tilted upwar'dy to afraised position in which the die and the'head plate fcarrying the same turn abouta. horizontal'axis. z-f: Fig. 6 is a wiring' diagram motor by vmeanslof which' the head plate and the die'fare turned.

v`':Fig. 7. is aside viewofa modified form of die.

tor'is securedgthe plate alsoser'ving as'a'carrier for a post about Which isrotatably mounted affroller for engaging a'pipeiandf holding'the pipe in contact with thep'eripherabedge'face of the die during rotationY of the die and :bending of-the pipe.l

Another object of the invention is to `'provide a pipe bender having it'stopv-platefor table pivoted to a frame so thatit .may be tilted vertically and thus disposeithe dieeither horizontally overV the frame 4or vertically according Vtowhich position will be most conven'ientfol` the'person operating the pipe bender. v

Another object of the invention is to provide a pipe bender having the circular die so mounted upon the circular head that it may beeasily removed and another substituted.

AAnother object o f the vention is to` provide apipe bender which is simple in construction and very easy tooperate.

With these and other objects in view the in-s vention consists of a special construction and arrangementof parts illustrated in the accom-f panying drawings wherein:

Fig. 1 is aside elevation ofthe improved pipe bending machine.

Fig. 2 is a top plan view thereof.

Fig. 3 is a View upon an enlarged scale showing the improved pipe bending machine partially in side elevation andpartially in section.

Fig. 4 is a view showing the improved pipe bending machine 1n top plan upon an enlarged scale. l

, Fig ,5, is aside elevationshowing theplatform.

Thisv improved, pipebending machine has a frame TI formed of metal and provided with front and rearvlegs Zivanol` 3 secured at their upper ends to opposite ends of front and rear cross bars 4 Vand 5.4 Side. bars 6 extend between the front vand Irear'legs. and are Welded to ends of the front and rear'cross bars and in order to brace the vlegsthere have been provided bracing strips/TIv which 'extend diagonally in crossing relationftoxeach other and havetheir ends welded to; the=1egs..l Each `leg carries at its lower end a 'sleeve B which is' *internally threaded, and

through these' sleeves pass"` threaded rods or jack screws 9 having-feet 'I0 `swiveled to their lower ends and: .provided .with collars II serving as handjholds which are'of 'suicien't size to permit themh to .be''readily grasped and the jack' screws turned to' vertically adjustV them and thus allow thewirametobe" leveled'and also raised or'lowered' according to the fdesire of the person operating-thefpipebender.. A cross bar I2 which serves i as-anabutment-,bar is mounted between the front legs in closecontacting engagement with the rear vf ace ofthe front bar II -and the rearwardly ex-v tendingrlangeotthslbutment bar is formed near. its .ends with openings I3, there being similaropenings I 4 yfortified through end portions of thefront'crdss'barI v-Z-I. top Aplate' or platform I5' whicl'is formed of strong' metal is connected with the rear cross bar 5" by "hing'esjfland is of lrectangular shape and of 'su'chdi'mensions that it will rest upon the sidebars 6 andthe front. cross bar i when disposedhori'z'ontally and at rest upon the frame. When the platform or'topplate is in this horizontalposition it is secured'V by bolts I'I which are passed through openings' IIS in front'corner portions of the topplateand through 'the openings I4 withwhich these openings I8 register. yIt is necessaryY to limitre'arward movement of the top plate, when it is swungupwardly-- to the raised positionshowninFigure 5 and supportit in the raised'position.: In order to do so there have been for the reversible` vprovided arms I 9 which extend downwardly from rear corners of the top plate and are braced by bracing bars 2|) which have their vupper ends welded to the under face of the top plate near opposite side edges thereof and extend downwardly at a rearward incline with their lower ends welded to front edge portions of the arms. The length of the arms is such that when the top plate or platform is swung upwardly to the raised position free ends of the arms will engage the under face of the rearwardly extending iiange of the abutment bar l2 and openings formed in the arms will then register with the openings I3 so that bolts 2| or the" bolts |1 may be passed through them and rmly hold the arms against downward movement. The top plate or platform will thus be braced in its raised position.

and can not move out of the sition shown in Figure 5.

An electric motor 22 having a gear boxA 23/associated with it is disposed under the ltopplate where it is secured by bolts, 24. passedthrough the ears 25 and 2B of the motor and the gear box, it being understood that the gear box l.contains a conventional number and arrangement of gears and that one ofthe gears ,is carried-by a shaft 21 which projects upwardly fromthegear box and through an opening 28 Vformed centrally of the top plate lwithjits upper portion21' .of reduced diameter to form a circumferentiallyA extending shoulder 29. A disk 3|1which may be termed a turntable orvhead tsaboutqtheupper portion of the shaft 21 at rest upon the shoulder 29 and keys 3| are applied to cause the head or disk to turn with the` shaftgy Since gears inthe gear box are reducing gears the ,shaft 21 and the head 39 turn at a great deal slower speed than the speed of the motor shaft. .Threaded openings 32 are formed through the disk in spaced ,relation to each other along a line extending diametrically of the disk and inran end one of these openings is screwed the reduced and threaded `lower end portion or shank 33 of a pin 34 which projects upwardly from the diskadjacent,v the peripheral .edge thereof. A circular die 35 having a grooved marginal edge face rests upon :the upper faceof the head or disk where it is secured in concentric relation thereto4 by screws 36 which are passed through openings 31 rformed throughzthe die in equally spaced relation to opposite sides of the center opening of the disk and into certain ones of theV openings 32y formed in the disk..,. Three openings have been shown in Figure 3 between each end opening and the center opening of `the disk or turntable and therefore provision has been made to accommodate dies of three sizes but it will be understood that additionalopenings 32 may beformed in the disk if agreater number of dies are to be furnishedwith the pipe bending machine. The marginal edge of the die is spaced from the pin or post 34a sucient distance to allow a pipe, tube, or bar 31 to be applied to the grooved marginal edge of the die where it is held by action of the post with a portion of the pipe in engagement with a grooved roller 38 which is rotatably carried by a standard or post 39 rising from a rear corner portion of the platform or head plate |5. This roller cooperates with the pin 34 to hold the pipe in close tting engagement with the grooved die and when the die is turned the pipe will be gradually bent about the die to form a U-shaped bend in the pipe, as shown in Figure 4. The roller is slidable vertically upon the post 39 so that it can move to a perpendicular pomounted upon the turntable.

position in which its grooved edge is centered with respect to the grooved edge of the die and thus cause inner and outer side portions of a pipe or rod to be properly engaged in the grooves of the roller and the die and prevented from slipping out of engagement therewith. Having the roller slidable along the post will be especially advantageous if a multiple die is used instead of removing a die and substituting another of different size in place of the one already :Such a die is shown in Figure 7 and referring to this ligure it will be seenthat the multiple die 40 tapers towards its upper end and is shaped to provide a lower section 4|, an intermediate section 42, and an upper section 43. Thelower section is of the same size as the die 35 and the sections above it progressively smaller and in concentric relation to each other, it being understood that as many sections as desired may be provided and that the said sections may be integral with each other or formed separate andV suitably secured to each other. Instead of passing screws downwardly through the multiple die and into the openings in the turntable, vthe multiple die is formedvwith threaded sockets 44 leading from its vbottom face and screws are passed upwardly through the openings y in the turntable and screwed into these sockets. When a multiple die is used it will be necessary to use aipin 34 of sufcient length to engage a pipe or. rod engaged with any one of the sections of the multiple die. The motor 22 is a reversible motorso that directional rotation of the turntable may be controlled and this motor is provided with a reversing switch 45 and a'master switch 46, as shown in the wiring diagram in Figure 6, the reversing switch being only operated when it is desired to reverse the direction in which the turntable turns and the master switch being used for startingv and stopping the motor.

A rheostat 41` is provided to allow for varying the speedr of the motor 22 and therefore the turntable 30, as desired, by an operator.

Having thus described the invention, what is claimed is: g

A pipe bending machine comprising a frame, a top plate for the frame, a motorrnounted against theunder face of the top plate and havmg associated with it a gear box including a rotary'shaft projecting upwardly through the top plate, a turntable mounted upon and turning with the shaft and located above the top plate, said turntable being formed with threaded openings spaced from each other along a line extending diametrically of the turntable, a circular die removably secured upon the turntable concentric therewith byl fasteners passed downwardly through the die and screwed into selected ones of the threaded openings spaced equal distances from the center of the turntable, said die having a grooved marginaledge face, a pin screwed into an end one of the threaded openings and projecting upwardly from the turntable in spaced relation to the grooved edge face of the die, a post projecting upwardly from the top plate in spaced relation to the turntable, and a roller rotatably mounted upon said post and shiftable vertically thereon, said roller having a grooved peripheral surface spaced from the edge face of the turntable'and adapted to engage the outer side portion of a pipe and cooperate with the pintor holding the pipe infengagementwith the 6l y grooved edge face of the die when turned with Number Name Date the turntable to bend the pipe about the die. 916,530 Butler Mar. k30, 1909 A EDWARD SENNA. 1,272,552 Spencer July 16, 1918 1,506,154 Berthelsen Aug. 26, 1924 i REFERENCES CITED 5 1,604,242 Smedberg 'O'cl 26, 1926 The following references are of record in the 1,610,201 Cavagflaro Dec- 7 1926 maar this parent; 1,3421? Frarclsd- M351??? 1,3,18 Rowan Oc.1,93 UNITED STATES PATENTS 2,223,015 Haihorn Nov. 26, 1940` Number Name Date 10 276,763k Brock May l, 1883 v FOREIGN PATENTS 725,026;V Boehm Apr. 14, 1903 Number Country v e Date 805,231l Pembroke NOV- 21 1905 237,297 Great Britain Mar. 22, 1923 842111 Pedrick Jan- 22 1907 469,649 Great Britain July 29,1937

897,367 Ylliendrl'lcks Sept. 1, 1908 15 

